Two-phase immersed liquid-cooled battery pack

Abstract

The invention provides a two-phase immersed liquid-cooled battery pack, the two-phase immersed liquid-cooled battery pack comprises a box body, a plurality of single batteries and a plurality of buffer assemblies, the box body is provided with a cavity, and the cavity is used for filling immersion liquid; the plurality of single batteries are arranged in the cavity at intervals; the plurality of buffer assemblies are arranged among the single batteries, each buffer assembly comprises a buffer part and a spacer, the buffer parts are connected with the side surfaces of the single batteries, and the spacers are arranged on the sides, far away from the single batteries, of the buffer parts so as to form channels among the buffer parts, and the channels are used for accommodating immersion liquid. The spacer is arranged between the buffer pieces, a channel is formed between the buffer pieces, and the immersion liquid can flow into the channel, so that the space between the single batteries is filled, heat generated by the single batteries is adsorbed, latent heat of phase change of the immersion liquid is exerted, and the highest temperature of the immersed two-phase immersed liquid-cooled battery pack is reduced. In addition, the contact area of the immersion liquid and the distance piece can be increased through the micropores in the distance piece, so that turbulent flow components in the immersion liquid are increased, and the heat exchange capacity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a dual-phase immersed liquid-cooled battery pack. Background Art

[0002] At present, most of the liquid cooling systems based on lithium batteries use indirect liquid cooling technology, and immersion liquid cooling technology has been less studied. In the immersion liquid cooling system, the material and shape design between the battery cells are consistent with the indirect liquid cooling system, and two strips of foam materials are placed. In this case, the immersion liquid will not be evenly distributed between the battery cells, affecting the heat dissipation effect of the battery cells. Summary of the invention

[0003] The embodiments of the present invention provide a buffer component and a dual-phase immersion liquid-cooled battery pack, which can solve the problem that the immersion liquid in the dual-phase immersion liquid-cooled battery pack is not evenly distributed between the battery cells and the heat dissipation effect of the battery cells is not good.

[0004] An embodiment of the present invention provides a two-phase immersion liquid-cooled battery pack, which includes a box body, multiple single cells and multiple buffer assemblies. The box body is provided with a cavity, and the cavity is used to fill the immersion liquid; the multiple single cells are arranged in the cavity at intervals; the multiple buffer assemblies are arranged between the single cells, and the buffer assembly includes a buffer member and a spacer, the buffer member is connected to the side of the single cell, and the spacer is arranged on the side of the buffer member away from the single cell to form a channel between the buffer members, and the channel is used to contain the immersion liquid.

[0005] Optionally, the thickness of the buffer component is D, 0.5 mm≤D≤5 mm.

[0006] Optionally, there are multiple spacers, and the multiple spacers are arranged to be spaced apart from each other to form a channel.

[0007] Optionally, the spacer has a shape of at least one of a cylinder, a hemisphere, a square column, a truncated cone, a cone, and a pyramid.

[0008] Optionally, the plurality of spacers are evenly arranged, and the interval between adjacent spacers is L, 50 micrometers ≤ L ≤ 200 micrometers.

[0009] Optionally, the number of spacers per unit area gradually decreases in a direction from the center of the side surface of the single battery to the edge of the side surface of the single battery.

[0010] Optionally, the spacer is provided with a plurality of through slots which are spaced apart from each other and parallel to each other.

[0011] Optionally, micropores are formed on the spacer.

[0012] Optionally, the diameter of the micropore is R, 200 nanometers ≤ R ≤ 500 nanometers.

[0013] Optionally, the micropores have diameters of at least five sizes, which are R, 0.414R, 0.225R, 0.177R, and 0.116R, respectively.

[0014] Optionally, the buffer component is provided with a plurality of through holes along the thickness direction thereof.

[0015] Optionally, the material of the buffer is one of foam and silicone; and / or the material of the spacer is one of aluminum and copper.

[0016] Optionally, it is characterized in that the box body includes a first end and a second end arranged opposite to each other, the first end is provided with a first liquid inlet, and the second end is provided with a first liquid outlet; the two-phase immersion liquid-cooled battery pack also includes a liquid cooling plate, the liquid cooling plate is adjacent to the box body, the liquid cooling plate is used to contain cooling liquid, the liquid cooling plate includes a third end and a fourth end arranged opposite to each other, the third end is provided with a second liquid outlet, and the fourth end is provided with a second liquid inlet; wherein the first end is adjacent to the third end, and the second end is adjacent to the fourth end.

[0017] Beneficial effects of the present invention:

[0018] The single cells and buffer assemblies are arranged alternately in sequence. The buffer assembly is provided with a buffer part connected to the side of the single cell, so as to achieve a buffering effect. The spacer is arranged between the buffer parts to form a channel between the buffer parts. The immersion liquid can be accommodated in the channel, so as to fill the space between the single cells, so that the distribution of the immersion liquid is more uniform, the heat generated by the single cell is absorbed, the heat dissipation effect is improved, and the temperature of the single cell is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of the structure of a dual-phase immersion liquid-cooled battery pack provided by an embodiment of the present invention;

[0021] Figure 2 A cross-sectional schematic diagram of a single battery and a buffer assembly provided in an embodiment of the present invention in combination;

[0022] Figure 3 The embodiment of the present invention provides Figure 2 A partial enlarged schematic diagram of the middle A area;

[0023] Figure 4A schematic diagram of the structure of a single battery and a buffer assembly provided in one embodiment of the present invention;

[0024] Figure 5 The embodiment of the present invention provides Figure 4 A schematic diagram of the structure of the middle partition;

[0025] Figure 6 A schematic diagram of the structure of a single battery and a buffer assembly provided in one embodiment of the present invention;

[0026] Figure 7 The embodiment of the present invention provides Figure 6 A schematic diagram of the structure of the middle partition;

[0027] Figure 8 A cross-sectional schematic diagram of a single battery and a buffer assembly provided in an embodiment of the present invention in combination;

[0028] Fig. 9 The embodiment of the present invention provides Figure 8 A partial enlarged schematic diagram of area B in the middle.

[0029] Description of reference numerals:

[0030] Box body 20, first end 21, second end 23, first liquid inlet 25, first liquid outlet 27;

[0031] The single battery 30, the buffer assembly 10, the buffer member 12, the through hole 122, the spacer 14, the through groove 142; the micro hole 144, the liquid cooling plate 40, the third end 41, the fourth end 43, and the second liquid inlet 45;

[0032] The second liquid outlet 47 . DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, or are the orientation or positional relationship in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] refer to Figures 1 to 3 , Figure 1 A schematic diagram of the structure of a dual-phase immersed liquid-cooled battery pack provided in an embodiment of the present invention. Figure 2 A cross-sectional schematic diagram of a single battery 30 and a buffer assembly 10 provided in an embodiment of the present invention are shown in FIG. Figure 3 The embodiment of the present invention provides Figure 2 A partial enlarged schematic diagram of area A in the middle.

[0037] The present invention provides a two-phase immersion liquid-cooled battery pack, which includes: a box 20, a plurality of single cells 30 and a plurality of buffer components 10. The box 20 is provided with a cavity, which is used to fill an immersion liquid, which may be a fluorinated liquid, an organic silicon liquid, etc., and which has a heat-conducting and insulating effect. The single cell 30 can store electrical energy, and the single cell 30 may be a lithium battery, a sodium battery, a storage battery, etc., and a plurality of single cells 30 are arranged in the cavity at intervals, and the single cell 30 generates heat during operation.

[0038] A plurality of buffer assemblies 10 are arranged between the single cells 30. The buffer assemblies 10 are elastic and thus have a buffering and shock absorbing effect. The buffer assemblies 10 include a buffer 12 and a spacer 14. The buffer 12 is connected to the side of the single cell 30. When the single cells 30 are arranged in the thickness direction, the buffer 12 is connected to the largest side of the single cell 30. When the single cells 30 are arranged in the width direction, the buffer 12 is connected to the smallest side of the single cell 30. The spacer 14 is arranged on the side of the buffer 12 away from the single cell 30 to form a channel between the buffer 12. The channel is used to contain the immersion liquid. The buffer 12 is arranged on opposite sides of the spacer 14.

[0039] There are at least two situations in which the spacer 14 is arranged on the side of the buffer 12 away from the single battery 30: a. spacers 14 are arranged on adjacent buffers 12, and the spacers 14 can be opposite to each other or staggered; b. on adjacent buffers 12, one buffer 12 is arranged with a spacer 14, and the other buffer 12 is not arranged with a spacer 14, the spacer 14 is connected to the other buffer 12, and there can be a gap between the spacer 14 and the other buffer.

[0040] During operation, the immersion liquid is constantly exchanged with the external immersion liquid to remove the heat from the single battery 30. The immersion liquid remaining in the channel will absorb the heat from the single battery 30. The immersion liquid will take away the immersion liquid in the channel during the flow process, thereby taking away the heat in the channel.

[0041] In the present invention, the single cells 30 and the buffer components 10 are alternately arranged in sequence. The buffer components 10 are provided with buffer parts 12 connected to the sides of the single cells 30, so as to achieve a buffering effect. The spacers 14 are arranged between the buffer parts 12 to form channels between the buffer parts 12. The immersion liquid can be accommodated in the channels, thereby filling the space between the single cells 30, making the distribution of the immersion liquid more uniform, absorbing the heat generated by the single cells 30, improving the heat dissipation effect, and reducing the temperature of the single cells 30.

[0042] Therefore, the present invention increases the heat exchange area between the immersion liquid and the single battery 30, and each surface of the single battery 30 can be wrapped by the immersion liquid to improve the immersion liquid's heat absorption effect on the single battery 30, so as to achieve the effect of uniform temperature of the single battery 30.

[0043] The buffer member 12 may be foam or silica gel, etc. The spacer 14 may be made of copper or aluminum.

[0044] In an optional embodiment, the thickness of the buffer assembly 10 is D, 0.5 mm ≤ D ≤ 5 mm, where D is the thickness of the buffer assembly 10 before being compressed or deformed, and this thickness can also indirectly replace the thickness between the single batteries 30, and D can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc. When the thickness of the buffer assembly 10 is within this range, the buffer member 12 can have a large enough deformation space, and there is also space for the spacer 14 to be placed to form a channel for the immersion liquid to flow.

[0045] When the thickness of the buffer assembly 10 is less than this range, the buffer 12 and the spacer 14 cannot be properly arranged to form a channel for the immersion liquid to flow. When the thickness of the buffer assembly 10 is greater than this range, the buffer 12 and the spacer 14 occupy too much space, thereby squeezing out the space of the single battery 30, thereby reducing the energy density of the dual-phase immersion liquid-cooled battery pack.

[0046] refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the structure of a single battery 30 and a buffer assembly 10 provided in an embodiment of the present invention. Figure 5 The embodiment of the present invention provides Figure 4 A schematic structural diagram of the middle partition 14.

[0047] In an optional embodiment, there are multiple spacers 14, and multiple spacers 14 are arranged at intervals to form a channel. The spacers 14 are independent of each other, and adjacent spacers 14 are spaced to form a channel, so the circumference of the spacers 14 is empty, so there is a relatively large space to form a channel, so as to increase the space of the channel and retain more immersion liquid. The immersion liquid can also fully contact the spacers 14 to absorb heat. In addition, multiple spacers are distributed between the buffers 12, which can form a better support for all parts of the buffer 12 as a whole to maintain a normal shape.

[0048] The spacer 14 may be cylindrical in shape, in which case the upper and lower surfaces of the spacer 14 are circular and respectively connected to the buffer 12. The cylindrical circumference is a curved surface with an arc transition, which can reduce the resistance to the immersion liquid when in contact with the immersion liquid, thereby improving the circulation efficiency of the immersion liquid.

[0049] like Figure 6 and Figure 7 The spacer 14 may also be in a hemispherical shape, in which case one side of the spacer 14 is a plane in contact with one buffer 12, and the other side of the spacer 14 is a spherical surface in point contact with one buffer 12. The hemispherical spacer 14 uses the spherical surface as the circumferential surface to contact the immersion liquid, and when in contact with the immersion liquid, it can further reduce the resistance to the immersion liquid compared to the cylindrical spacer, so as to further improve the circulation efficiency of the immersion liquid.

[0050] Of course, the spacer 14 can also be in various shapes such as square column, truncated cone, cone, pyramid, special shape, etc., which are not listed here one by one.

[0051] The plurality of spacers 14 can be arranged uniformly, that is, the spacings between adjacent spacers 14 are the same or substantially the same, and the spacing between adjacent spacers 14 is L, 50 microns ≤ L ≤ 200 microns. The spacing L can be 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, etc. When the spacing of the spacers 14 is within this range, the spacers 14 can provide good support for the buffer 12, and in addition, there is also a large enough space to form a channel for the immersion liquid to flow.

[0052] When the spacing between the spacers 14 is smaller than this range, the channels formed between the spacers 14 are too small to allow the immersion liquid to flow normally. When the spacing between the spacers 14 is larger than this range, the spacers 14 are insufficient to provide good support for the buffer 12 .

[0053] Furthermore, the arrangement density of the plurality of spacers 14 can be changed according to the deformation size of the single cell 30. For example, the number of spacers 14 can be increased at locations where the single cell 30 is deformed more greatly, and the number of spacers 14 can be reduced at locations where the single cell 30 is deformed less.

[0054] Specifically, the number of spacers 14 per unit area gradually decreases from the center of the side of the single battery 30 to the edge of the side of the single battery 30. In layman's terms, the arrangement of the spacers 14 on the side of the single battery 30 gradually becomes sparse from the center of the side to the outside, so that the spacers 14 provide the strongest support to the center of the single battery 30 and the weakest support to the edge of the single battery 30.

[0055] refer to Figure 8 and Fig. 9 , Figure 8 A cross-sectional schematic diagram of a single battery 30 and a buffer assembly 10 provided in an embodiment of the present invention are shown in FIG. Fig. 9 The embodiment of the present invention provides Figure 8 A partial enlarged schematic diagram of area B in the middle.

[0056] The spacer 14 is provided with a plurality of through grooves 142 which are spaced apart from each other and parallel to each other. For example, a plurality of through grooves 142 which are spaced apart from each other and parallel to each other are formed on the copper block by etching. The through grooves 142 may be along the length direction or along the width direction, and the through grooves 142 pass through the opposite ends of the spacer 14. The plurality of through grooves 142 form a channel to allow the flow of the immersion liquid.

[0057] In this embodiment, the spacer 14 is a whole, and the through grooves 142 are provided on the spacer 14 to ensure the stability of the distance between the through grooves 142, thereby ensuring that the immersion liquid can flow stably.

[0058] Please continue reading Figure 5 or Figure 7, micropores 144 are provided on the spacer 14. The micropores 144 are in a state of penetrating the spacer 14, and the immersion liquid can pass through the micropores 144, and the micropores 144 are used to change the droplet size of the immersion liquid through tension. The reduction of the droplet size will reduce the boiling temperature of the immersion liquid, that is, the phase change temperature from the liquid phase to the gas phase is reduced, and the immersion liquid realizes phase change at a lower temperature, thereby changing the phase change temperature of the immersion liquid to improve the heat dissipation effect of the immersion liquid. Taking fluorinated liquid as the immersion liquid as an example, in the process of the droplet size changing from 110μm to 50μm, the phase change temperature of the fluorinated liquid can be reduced from 78°C to 68°C. The phase change process will cause a change in state and absorb a large amount of heat. The process of the droplet from the liquid phase to the gas phase will use the principle of latent heat of phase change to absorb the heat generated by the battery, thereby reducing the temperature of the battery.

[0059] Specifically, the diameter of the micropore 144 is R, 200 nanometers ≤ R ≤ 500 nanometers, and the diameter R can be 200 nanometers, 220 nanometers, 250 nanometers, 280 nanometers, 300 nanometers, 310 nanometers, 330 nanometers, 350 nanometers, 380 nanometers, 390 nanometers, 400 nanometers, 410 nanometers, 430 nanometers, 440 nanometers, 450 nanometers, 480 nanometers, and 500 nanometers. Within this range, the micropore 144 will not destroy the overall strength of the spacer 14, and can effectively change the droplet size of the immersion liquid. When the diameter of the micropore 144 is larger than this range, the strength of the spacer 14 is greatly weakened, and it will break when squeezed. When the diameter of the micropore 144 is smaller than this range, the micropore 144 cannot effectively change the droplet size of the immersion liquid.

[0060] Further, the micropores 144 have at least five sizes of diameters, which are R, 0.414R, 0.225R, 0.177R, and 0.116R, respectively. The micropore 144 with a diameter of R is the first largest micropore 144, the micropore 144 with a diameter of 0.414R is the second largest micropore 144, the micropore 144 with a diameter of 0.225R is the third largest micropore 144, the micropore 144 with a diameter of 0.177R is the fourth largest micropore 144, and the micropore 144 with a diameter of 0.116R is the fifth largest micropore 144. By distributing the micropores 144 of these five sizes, as many micropores 144 as possible can be set on the spacer 14 without destroying the strength of the spacer 14, so as to maximize the contact area between the immersion liquid and the spacer 14, thereby better changing the droplet size of the immersion liquid.

[0061] In an optional embodiment, the buffer member 12 has a plurality of through holes 122 along its thickness direction. The through holes 122 may be arranged evenly or unevenly, and the immersion liquid may directly contact the side of the single battery 30 through the through holes 122, thereby improving the heat exchange efficiency.

[0062] In an optional embodiment, the box body 20 has a first end 21 and a second end 23 that are arranged opposite to each other. The first end 21 is provided with a first liquid inlet 25, and the second end 23 is provided with a first liquid outlet 27. When the immersion liquid is injected into the cavity of the box body 20 through the first liquid inlet 25, it is at a relatively low temperature state. As the immersion liquid flows in the cavity, the temperature of the immersion liquid gradually increases due to the direct contact between the immersion liquid and the single battery 30, and then is discharged from the first liquid outlet 27. In this embodiment, the immersion liquid in the box body 20 is flowing, which can more effectively take away the heat and improve the heat dissipation effect.

[0063] The liquid cooling plate 40 is adjacent to the box body 20 and is in indirect contact with the single battery 30. The liquid cooling plate 40 can be located at any position of the side, top, and bottom of the box body 20. The liquid cooling plate 40 shown in the figure is located at the bottom of the box body 20. The liquid cooling plate 40 contains a cooling liquid. The cooling liquid flows inside the liquid cooling plate 40 and can absorb and take away the heat transferred from the single battery 30 to the liquid cooling plate 40. The liquid cooling plate 40 also has a third end 41 and a fourth end 43 arranged opposite to each other. The third end 41 is provided with a second liquid outlet 47, and the fourth end 43 is provided with a second liquid inlet 45. The cooling liquid enters the liquid cooling plate 40 through the second liquid inlet 45. When entering the liquid cooling plate 40, the cooling liquid is also at a relatively low temperature state. As the cooling liquid flows in the liquid cooling plate 40, the cooling liquid absorbs the heat transferred from the single battery 30 to the liquid cooling plate 40, and the temperature of the cooling liquid gradually increases, and then is discharged from the second liquid outlet 47.

[0064] Among them, the first end 21 and the third end 41 are adjacent, and the second end 23 and the fourth end 43 are adjacent. Therefore, the first liquid inlet 25 of the immersion liquid and the second liquid outlet 47 of the cooling liquid are relatively close, and the first liquid outlet 27 of the immersion liquid and the second liquid inlet 45 of the cooling liquid are also relatively close. It can be understood that although the temperature of the immersion liquid at the first liquid outlet 27 of the second end 23 is relatively high, which is not conducive to the heat dissipation of the area near the second end 23 of the box body 20, the second liquid inlet 45 close to it is injected with coolant with a lower temperature, and the coolant with a lower temperature can effectively help the area near the second end 23 to dissipate heat and cool down.

[0065] Similarly, although the temperature of the coolant at the second liquid outlet 47 of the third end 41 is relatively high, which is not conducive to the third end 41 of the liquid cooling plate 40 absorbing the heat of the first end 21 of the box 20 adjacent thereto, the first liquid inlet 25 close thereto injects the immersion liquid with a relatively low temperature, and the immersion liquid with a relatively low temperature can effectively help the area near the first end 21 to dissipate heat and cool down. Therefore, for the single battery 30 in the box 20, whether at the first end 21 or the second end 23 of the box 20, there is always a relatively low temperature cooling medium that can effectively help the single battery 30 to cool down.

[0066] In this embodiment, the relative positions of the first liquid inlet 25 and the first liquid outlet 27 of the immersion liquid and the second liquid inlet 45 and the second liquid outlet 47 of the cooling liquid are carefully arranged so that the immersion liquid and the cooling liquid of the battery pack 10 can work together, and the single cells 30 can be fully cooled in different areas, ensuring that the heat generated by the single cells 30 is dispersed more evenly and effectively, reducing the temperature difference on the surface of the single cells 30, avoiding the local accumulation of heat in the single cells 30, making the temperature distribution of the entire single cell 30 more uniform, and reducing the risk of performance degradation and shortened life of the single cells 30 caused by temperature differences.

[0067] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0068] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0070] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A two-phase immersion liquid-cooled battery pack, characterized in that: include: The box body is provided with a cavity, wherein the cavity is used for filling the immersion liquid; A plurality of single cells are arranged in the cavity at intervals; A plurality of buffer assemblies are arranged between the single cells, the buffer assemblies comprising buffer members and spacers, the buffer members are connected to the side surfaces of the single cells, the spacers are arranged on the side of the buffer members away from the single cells to form channels between the buffer members, the channels being used to contain immersion liquid.

2. The dual-phase immersion liquid-cooled battery pack according to claim 1, characterized in that: The thickness of the buffer component is D, 0.5 mm≤D≤5 mm.

3. The dual-phase immersion liquid-cooled battery pack according to claim 1, characterized in that: There are multiple spacers, and the multiple spacers are spaced apart from each other to form the channel.

4. The dual-phase immersion liquid-cooled battery pack according to claim 3, characterized in that: The spacer has a shape of at least one of a cylinder, a hemisphere, a square column, a truncated cone, a cone, and a pyramid.

5. The dual-phase immersion liquid-cooled battery pack according to claim 3, characterized in that: The plurality of spacers are evenly arranged, and the distance between adjacent spacers is L, 50 microns ≤ L ≤ 200 microns.

6. The dual-phase immersion liquid-cooled battery pack according to claim 3, characterized in that: The number of the spacers per unit area gradually decreases in a direction from the center of the side surface of the single battery to the edge of the side surface of the single battery.

7. The dual-phase immersion liquid-cooled battery pack according to claim 1, characterized in that: The spacer is provided with a plurality of through slots which are spaced apart from each other and parallel to each other.

8. The dual-phase immersion liquid-cooled battery pack according to any one of claims 1 to 7, characterized in that: The spacer is provided with micro holes.

9. The dual-phase immersion liquid-cooled battery pack according to claim 8, characterized in that: The diameter of the micropore is R, 200 nanometers ≤ R ≤ 500 nanometers.

10. The dual-phase immersion liquid-cooled battery pack according to claim 8, characterized in that: The micropores have at least five diameter sizes, which are R, 0.414R, 0.225R, 0.177R, and 0.116R, respectively.

11. The dual-phase immersion liquid-cooled battery pack according to any one of claims 1 to 7, characterized in that: The buffer member is provided with a plurality of through holes along the thickness direction thereof.

12. According to any one of claims 1 to 7, the dual-phase immersion liquid-cooled battery pack is made of a material selected from the group consisting of foam and silica gel; and / or the spacer is made of a material selected from the group consisting of aluminum and copper.

13. The dual-phase immersion liquid-cooled battery pack according to any one of claims 1 to 7, characterized in that: The box body comprises a first end and a second end which are arranged opposite to each other, the first end is provided with a first liquid inlet, and the second end is provided with a first liquid outlet; The dual-phase immersed liquid-cooled battery pack further includes a liquid cooling plate, the liquid cooling plate is adjacent to the box body, the liquid cooling plate is used to contain cooling liquid, the liquid cooling plate includes a third end and a fourth end that are oppositely arranged, the third end is provided with a second liquid outlet, and the fourth end is provided with a second liquid inlet; The first end portion is adjacent to the third end portion, and the second end portion is adjacent to the fourth end portion.

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